Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff104adc6dfe4f2…

MALICIOUS

PDF

46.8 KB Created: 2021-05-15 10:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a222b592f31087e29bd245f730a407a7 SHA-1: 8c69079b083413b9a48277f393a7ac5d28814b7a SHA-256: cff104adc6dfe4f25c8bec2c566e159b16581e5e8fc0c8a8be4132df08336cb5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are structured as 'link farms' or redirectors for game hacks and free in-game currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests the intent is to direct users to potentially malicious sites. The presence of a 'download button' lure further supports a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/robux-hack-2021-game-hack PDF link annotation
    • https://www.gpn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/how-to-win-robux_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.gpn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A02 25908 bytes
SHA-256: c47d9161d84a54f6690cf466c622f9f83b96e6abd7780e238d4988950c0e905e
font_01_sfnt_off00008609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8609 3988 bytes
SHA-256: 1ba32a5139c6de22584ee0f72d573162a644f7c4206fa3a2a8dea775e8e2a087
font_02_sfnt_off00009325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9325 18648 bytes
SHA-256: 960613bb0fa4c19a2503237e067522a4d484b1b5f3e7387dbdf2c2d9282ca05f

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